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This paper presents a novel start-up scheme for the modular multilevel converter. Firstly a charging process model is introduced and the process of the proposed start-up scheme is presented. Then the maximum current and current-time formula during the charging process is derived. The mathematical solution of the formulas is used to compare with the results from a three-phase simulation using Matlab/Simulink...
The relationship between resonant control and repetitive control is investigated in this paper. Resonant control and repetitive control are compared by using them to an active power filter (APF). The stability and design of parameter with the two control methods in APF system are analyzed, and the steady-state error and transient response are also analyzed for them. The theory is verified by experiment.
In this paper, biosorption of C.I Acid Yellow 199 on magnetic sargasso from wastewater was studied. The influence of initial pH, temperature, initial dye concentration and biosorbent dose were investigated by a series of static adsorption experiments. It was observed that the optimum initial pH value was 2.0. The Langmuir and Freundlich isotherm models were applied to describe the biosorption isotherm...
A generalized quadrature formula was introduced to estimate the numerical solutions of the integral of convex functions. The formula was composed of the difference between two parts of the areas of the trapezoid and the weighted convex patch. The range of weight coefficient of the convex patch was from 0 to 1 evaluated by the Hadamard's inequality. Tuning the weighted value of the convex patch could...
This work describes an optical measuring device that comprises multiple laser mouse sensors to estimate 3-DOF planar motion. The linear least squares (LLS) method and nonlinear least squares (NLS) method are adopted to estimate the positions in this over-determined system. Two circular trajectories - non-orientated and self-orientated - are employed to evaluate the feasibility of the proposed device...
This paper intends to develop a terminal guidance law against very high speed targets. Traditionally, proportional navigation guidance (PNG) is mostly effective for interceptors and targets with ideal dynamics and constant speeds during the collision course, however, which is non-robust for two objects with non-constant speeds and non-ideal dynamics. To overcome the weakness, the interceptor considered...
This paper simulates human visual perception with regard to visual adaptation under the change of illumination. To reflect visual adaptation in scene rendering, we adopt the mathematic models simulating photopic, scotopic, and mesopic vision. We also take consideration the characteristic that adaptation to low visibility takes longer than high visibility. As a result, the outcome of the animation...
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